feat(worker): extend ClaudeArgsBuilder with MaxTurns and PermissionMode

tests/ClaudeDo.Worker.Tests/Runner/ClaudeArgsBuilderTests.cs

@@ -92,4 +92,88 @@ public sealed class ClaudeArgsBuilderTests
 
         Assert.Contains("\"col1", args);
     }
+
+    [Fact]
+    public void MaxTurns_Adds_Flag_When_Positive()
+    {
+        var args = _builder.Build(new ClaudeRunConfig(null, null, null, null, MaxTurns: 25));
+        Assert.Contains("--max-turns 25", args);
+    }
+
+    [Fact]
+    public void MaxTurns_Omitted_When_Null_Or_ZeroOrLess()
+    {
+        var a = _builder.Build(new ClaudeRunConfig(null, null, null, null, MaxTurns: null));
+        var b = _builder.Build(new ClaudeRunConfig(null, null, null, null, MaxTurns: 0));
+        Assert.DoesNotContain("--max-turns", a);
+        Assert.DoesNotContain("--max-turns", b);
+    }
+
+    [Fact]
+    public void PermissionMode_bypass_Keeps_DangerousFlag()
+    {
+        var args = _builder.Build(new ClaudeRunConfig(null, null, null, null, PermissionMode: "bypassPermissions"));
+        Assert.Contains("--dangerously-skip-permissions", args);
+        Assert.DoesNotContain("--permission-mode", args);
+    }
+
+    [Fact]
+    public void PermissionMode_acceptEdits_Emits_PermissionMode_Flag()
+    {
+        var args = _builder.Build(new ClaudeRunConfig(null, null, null, null, PermissionMode: "acceptEdits"));
+        Assert.Contains("--permission-mode acceptEdits", args);
+        Assert.DoesNotContain("--dangerously-skip-permissions", args);
+    }
+
+    [Fact]
+    public void PermissionMode_Null_Defaults_To_BypassPermissions()
+    {
+        var args = _builder.Build(new ClaudeRunConfig(null, null, null, null));
+        Assert.Contains("--dangerously-skip-permissions", args);
+    }
+}
+
+public sealed class MergeInstructionsTests
+{
+    [Fact]
+    public void All_Empty_Returns_Empty()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions(null, null, null);
+        Assert.Equal("", s);
+    }
+
+    [Fact]
+    public void Only_Global_Returns_Global()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions("global rule", null, null);
+        Assert.Equal("global rule", s);
+    }
+
+    [Fact]
+    public void Only_Task_Returns_Task()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions(null, null, "task rule");
+        Assert.Equal("task rule", s);
+    }
+
+    [Fact]
+    public void Global_And_Task_Are_Prepended_With_Separator()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions("global rule", null, "task rule");
+        Assert.Equal("global rule\n\ntask rule", s);
+    }
+
+    [Fact]
+    public void All_Three_Are_Joined_In_Order()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions("G", "L", "T");
+        Assert.Equal("G\n\nL\n\nT", s);
+    }
+
+    [Fact]
+    public void Whitespace_Only_Parts_Are_Skipped()
+    {
+        var s = ClaudeDo.Worker.Runner.TaskRunner.MergeInstructions("   ", "L", "\t\n");
+        Assert.Equal("L", s);
+    }
 }